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    PR # 31057                                                                   
     Recently ROSAT and ASCA detected several soft and ultra-soft transien       
     t X-ray sources in quiescence with luminosities near 1x10^33 erg/sec.       
      These observations suggest that the X-ray spectrum is very soft, whi       
     ch is not a simple extrapolation of the energy spectra in the bright        
     states.  In order to extend our knowledge on X-ray emission in quiesc       
     ence, we propose to observe two soft transient sources; 4U2129+47 (a        
     partial eclipsing binary) and Aql X-1.  From detection/non-detection        
     of partial eclipses and the X-ray energy spectrum of 4U2129+47, we ca       
     n constrain the size and location of the emission region. For Aql X-1       
     , we would like to study whether there is a second hard component or        
     not.  Such a hard component, if it exists, may have a connection to t       
    he X-ray emission in the brigh                                               
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